JP5125331B2 - Resin composition and resin molded body - Google Patents

Description

  The present invention relates to a resin composition and a resin molded body.

  Conventionally, a flame retardant is mixed in a resin material that requires flame retardancy for flame retardancy. As the flame retardant mixed with the resin material, for example, halogen compounds and phosphorus compounds are widely known. However, particularly in the case of petroleum-based resin materials, there is a tendency to avoid mixing halogen compounds that may generate dioxins during incineration. Therefore, in recent years, phosphorus compounds are often used as flame retardants as an alternative to halogen compounds.

  However, ester bond-containing materials such as phosphoric acid esters, which are the most versatile among phosphorous compounds, are subject to degradation due to the hydrolysis of esters due to the phosphoric acid contained in the compounds themselves. There is a problem that the mechanical characteristics, recyclability and processability deteriorate. For this reason, it has been difficult to use phosphorus compounds as housing materials for copying machines, printers, and the like having high-temperature portions therein.

  Therefore, resin materials using flame retardants other than halogen compounds and phosphorus compounds are required. As such a resin material, for example, Patent Document 1 below proposes a flame retardant resin composition using a styrene resin, an alkylene oxide adduct of a dihydroxyaryl compound, and a boron oxide and / or an aminotriazine sulfate compound. ing. Further, Patent Document 2 below proposes a flame retardant resin composition using an aromatic polymer having a sulfonic acid group and / or a sulfonic acid group introduced therein as a flame retardant.

Japanese Patent Laid-Open No. 2005-220318 JP 2005-272539 A

However, in the flame retardant resin composition described in Patent Document 1, an alkylene oxide adduct of a dihydroxyaryl compound and a boron oxide and / or aminotriazine sulfate compound serve as a flame retardant. The flame retardant effect after the thermal test is not always sufficient. Boron oxide is hygroscopic and absorbs moisture in the air. Moisture accumulated by boron oxide in the resin deteriorates the resin and reduces not only flame retardancy but also mechanical properties. For the same reason, when the flame retardant resin composition is recycled, moisture absorption is not absorbed when pelletizing, and various physical properties after recycling are reduced. Boron oxide is a substance designated by the PRTR system (chemical substance discharge / transfer amount notification system) and has an allowable concentration of TLV: 10 mg / m ³ (TWA) (ACGIH 2001). Such additives can be exposed everywhere in the manufacturing process (exposure during metering during processing, fume during injection molding), at the customer and in the product cycle leading to the disposal of the molded product. It is desirable to refrain.

  In addition, the flame retardant resin composition described in Patent Document 2 does not necessarily have sufficient flame retardancy when a resin having an ester bond in the resin, for example, a resin other than a resin mainly composed of polycarbonate or the like is used. There is a disadvantage that it cannot be satisfied. This is because in this flame retardant mechanism, sulfur oxide attacks the ester bond and gels while decarboxylating. Such a flame retardant has been known for a long time, and some products using the mechanism are known (KSS-FR manufactured by SLOSS, Hirohiro manufactured by Suzuyu Chemical Co., Ltd.). Moreover, although the said patent document 2 (refer paragraph [0032]) describes that sulfonic acid Na salt, sulfonic acid K salt, etc. are preferable, using such water-soluble salt is in resin. With moisture absorption deterioration, it is not preferable in characteristics for the same reason as described above. In addition, the flame retardant resin composition described in Patent Document 2 sufficiently satisfies all of the processability of the resin composition and the mechanical properties, recyclability, and flame retardancy of the obtained resin molded body. It is also difficult.

  The present invention has been made in view of the above-mentioned problems of the prior art, and can form a resin molded body having sufficient flame retardancy and excellent in mechanical characteristics and recyclability, and processed. It aims at providing the resin composition excellent also in the property, and the resin molding using the same.

In order to achieve the above object, the present invention provides a radical trapping agent having one or more of a nitrogen atom and a sulfuric acid group, a char forming agent having a carbonate group, phenylpolystyrene carbonate, a resin having a styrene group. Yes and to provide a resin composition containing a compound different from the char-forming agent having a different compound and / or phenyl carbonate groups and the char-forming agent.

According to the resin composition, as the resin, of the different compounds, nitrogen atom and sulfate groups and the char-forming agent having a different compound and / or phenyl carbonate groups and have a styrene group the char-forming agent When having a structure containing a radical trapping agent having one or more kinds and phenyl carbonate carbonate as a char-forming agent having a carbonate group, excellent processability is obtained and when a resin molded body is formed. Sufficient flame retardancy and excellent mechanical properties and recyclability can be obtained.

  Here, the reason why sufficient flame retardancy is obtained in the resin molded body formed using the resin composition of the present invention is considered as follows. That is, when the resin molded body ignites, the above radical trapping agent is thermally decomposed by a temperature rise to become a radical trapping substance, and the radical trapping substance captures active radicals (such as active OH radicals) of the decomposition product of the resin. To stop the chain of combustion reactions. At the same time, when the resin molded body ignites, the char-forming agent burns to form a carbonized layer, and this carbonized layer performs the blocking of the supply of decomposition products and the heat insulation from the flame, Further fire spread is prevented. And in the resin molding which consists of a resin composition of the present invention, the suppression effect of the combustion reaction by capture of active radicals and the fire spread prevention effect by formation of the carbonized layer are synergistically exhibited, and excellent flame retardancy It is considered to be obtained.

  In addition, the resin molding which consists of the resin composition of this invention is sufficient flame retardance similarly to the case where either one is contained in a large quantity by containing a radical trap agent and a char formation agent simultaneously. While maintaining the above, it is possible to obtain more excellent mechanical properties.

  In addition, when the resin composition is used as a molding material for home appliances, office equipment, etc., the level of flame retardancy required for the resin molded product varies depending on the product, but is generally equal to or higher than V-2 in the UL-94 standard. Fire resistance is often required. According to the resin molded body made of the resin composition of the present invention, it is possible to easily realize flame retardancy equivalent to V-2 or higher in the UL-94 standard.

  Furthermore, since the resin composition of the present invention and the resin molded body formed using the resin composition have sufficient flame retardancy without using a halogen compound and a phosphorus compound as a flame retardant, the viewpoint of environmental problems and recyclability Is very useful in terms of In particular, since the resin molded body can sufficiently suppress deterioration due to heat, it is very useful as a housing of a copying machine, a printer, or the like having a high temperature portion inside.

  In the resin composition of the present invention, the radical trapping agent is preferably a compound having a decomposition temperature lower than that of the resin in thermogravimetry according to JIS K7120. Thereby, the radical trap substance is released in the vicinity of the combustion field before the decomposition of the resin, and the decomposition product of the resin that decomposes thereafter can be effectively captured.

In the resin composition of the present invention, the radical trapping agent is more preferably a compound having one or more sulfate groups per molecule. Thereby, the decomposition product of resin can be captured more effectively.
In the resin composition of the present invention, the radical trapping agent is more preferably melamine sulfate.

  The char-forming agent is preferably a compound having a residual ratio at 600 ° C. equal to or higher than that of the resin in thermogravimetry according to JIS K7120. Thereby, sufficient char (carbonized layer) can be formed on the resin. Therefore, the char can insulate the radiant heat from the combustion field, and furthermore, the effect of suppressing decomposition products from the resin can be sufficiently obtained. In addition, it is thought that said effect is so effective that there is much quantity of char production | generation.

  In the present invention, when the value (%) of the residual rate at 600 ° C. of the char forming agent is within ± 1% of the value (%) of the residual rate at 600 ° C. of the resin, these Residual rate values are assumed to be the same.

  Moreover, it is preferable that the said char formation agent is a compound which has a phenyl carbonate group and content of the said phenyl carbonate group on the basis of the said char formation agent whole quantity is 35 mass% or more. Thereby, the amount of char formation can be increased effectively.

  Moreover, it is preferable that the radical trapping agent is melamine sulfate and the char forming agent is phenylpolystyrene carbonate. According to such a resin composition, excellent processability is obtained, and when a resin molded body is formed, the release of radical trapping material and the formation of char can be more effectively expressed, so that sufficient flame retardancy is achieved. As compared with the case where water absorption between the radical trapping agent and the char forming agent blended in the resin is not taken into consideration, excellent mechanical properties and recyclability can be obtained.

  Furthermore, the resin is preferably a compound having a styrene group and / or a phenyl carbonate group. When the resin is a compound having a styrene group and / or a phenyl carbonate group, the compatibility with the char-forming agent is improved, and it becomes possible to form a resin molded body having more excellent flame retardancy. .

The present invention also provides a resin molded body obtained by molding the resin composition of the present invention. According to the resin molding, and the radical trapping agent having one or more of the nitrogen atoms and a sulfuric acid group, as the char-forming agent having a carbonate group, a phenyl carbonate polystyrene, as a resin, have a styrene group A compound different from the char-forming agent and / or a compound having a phenyl carbonate group and different from the char-forming agent. Therefore, sufficient flame retardancy, excellent mechanical properties and Recyclability can be obtained.

  According to the present invention, even when a flame retardant other than a halogen compound or a phosphorus compound is used, it is possible to form a resin molded article having sufficient flame retardancy and excellent mechanical properties and recyclability. In addition, a resin composition excellent in processability can be provided. Moreover, according to this invention, the resin molded object which has sufficient flame retardance, and was excellent in mechanical characteristics and recyclability can be provided.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings as the case may be. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and redundant description is omitted.

The resin composition of the present invention, a radical trapping agent having more than one kind of a nitrogen atom and a sulfuric acid group, a char-forming agent having a carbonate group, a phenyl carbonate polystyrene, as a resin, chromatic and the char styrene group It contains a compound different from the forming agent and / or a compound having a phenyl carbonate group and different from the char forming agent.

The resin, if example embodiment, an acrylonitrile - butadiene - styrene copolymer (ABS), methylpentene, thermoplastic vulcanized elastomers, thermoplastic polyurethanes, styrene - isoprene - styrene block copolymer, silicone, styrene - ethylene - propylene - Styrene block copolymer, styrene-ethylene-butylene-styrene block copolymer, styrene-butadiene-styrene block copolymer, styrene-butadiene rubber, styrene-butadiene copolymer, acrylonitrile-styrene copolymer, polyvinylpyrrolidone, Polyvinyl alcohol, polyvinyl methyl ether, polyvinyl isobutyl ether, polyvinyl formal, polyvinyl butyral, polyvinyl acetate, polyvinyl alcohol, polytrimethylene terephthalate Polysulfone, polysulfone, polystyrene, polyphenylene sulfide, polyphenylene ether, polypropylene, polyphthalamide, polyoxymethylene, polymethylpentene, polymethyl methacrylate, polymethacrylonitrile, polymethoxyacetal, polyisobutylene, thermoplastic polyimide, polyethylene Terephthalate, polyethersulfone, polyethylene naphthalate, polyethernitrile, polyetherimide, polyetheretherketone, polyethylene, polycarbonate, polybutylene terephthalate, polybutadienestyrene, polyparaphenylenebenzobisoxazole, poly-n-butyl methacrylate, polybenzo Imidazole, polybutadiene acrylonitrile, polybutene-1, polya Rusulfone, polyarylate, polyacrylonitrile, thermoplastic polyester alkyd resin, thermoplastic polyamideimide, polyacrylic acid, polyamide, natural rubber, nitrile rubber, methyl methacrylate butadiene styrene copolymer, polyethylene, isoprene rubber, ionomer, butyl rubber, furan resin , Ethylene-vinyl alcohol copolymer, ethylene-vinyl acetate copolymer, ethylene-propylene-diene terpolymer, cellulose propionate, hydrin rubber, carboxymethylcellulose, cresol resin, cellulose acetate propionate, cellulose acetate butyrate , Cellulose acetate, bismaleimide triazine, cis 1,4 polybutadiene synthetic rubber, acrylonitrile styrene acrylate, acryloni Examples include tolyl-styrene copolymer, acrylonitrile-ethylene-propylene-styrene copolymer, acrylate rubber, and polylactic acid. These can be used individually by 1 type or in combination of 2 or more types.

In the present invention, the resin is a compound having a styrene group and / or a compound having a phenyl carbonate group because the resin is excellent in compatibility with the char-forming agent and imparts more excellent flame retardancy. The resin is a compound different from the char forming agent described later. When the char forming agent is a compound having a phenyl carbonate group, the compatibility with the compound having a styrene group and / or the resin having a phenyl carbonate group is very good. Examples of the compound having a styrene group and / or a resin having a phenyl carbonate group include acrylonitrile-butadiene-styrene copolymer (ABS), polycarbonate (PC), polystyrene (PS), acrylonitrile-styrene copolymer (AS), and styrene. What contains 1 or more types of phosphonic acid resin, a styrene formalin resin, and a styrene resin is preferable. In the case of forming a casing of a copying machine, a printer or the like as the resin molded body, acrylonitrile-butadiene-styrene copolymer (ABS) is particularly suitable as the resin.

Radical trapping agent has one or more of the nitrogen atom and a sulfate group is not particularly limited as long as it can capture an active radical generated during the resin burn. Examples of such radical trapping agents include compounds having electron-withdrawing properties. For example, among sulfates and sulfates, molecules composed of counter ions other than group Ia of the periodic table are desirable. This is because the group Ia may be water-soluble and easily deteriorate the resin characteristics. Preferably, the counter ion is organic, for example, melamine sulfate, guanidine sulfate or the like, or a salt of a compound containing benzene and sulfonic acid, for example, barium aminobenzenesulfonate, aluminum benzimidazolesulfonate, or the like. These can be used individually by 1 type or in combination of 2 or more types.

  In addition, the radical trapping agent is a compound composed of N, C, H and O, and a compound A having a combustion residue of 0% at 500 ° C. and a compound having a sulfuric acid group and having a combustion residue at 500 ° C. It is also preferable to use 0% of Compound B in combination. Thus, the flame retardance which was excellent by using together compound A and B without a residue alone can be obtained. Here, as compound A, melamine cyanurate etc. are mentioned, for example, As compound B, melamine sulfate etc. are mentioned, for example.

  As the radical trapping agent, a compound having a decomposition point of 400 ° C. or lower or a compound having two or more sulfuric acid groups per molecule is preferably used, and the decomposition point is 400 ° C. or lower and per molecule. It is particularly preferable to use a compound having two or more sulfate groups.

As the radical trapping agent, from the viewpoint of withdrawing the free radical it is preferably a compound having one or more of the nitrogen atom and a sulfate group, a compound having a sulfate group is more preferable.

  Further, the radical trapping agent has a decomposition temperature lower than that of the above resin in thermogravimetry according to JIS K7120 from the viewpoint of decomposing before the resin and waiting for a decomposition product of the resin to be decomposed later. A compound is preferred. In addition, as specific decomposition temperature of a radical trap agent, it is preferable that it is 200-500 degreeC, and it is more preferable that it is 250-450 degreeC.

  In the resin composition of the present invention, the content of the radical trapping agent is preferably 0.1 to 50 parts by mass, and more preferably 5 to 30 parts by mass with respect to 100 parts by mass of the resin. If this content is less than 0.1 parts by mass, the flame retardancy of the resulting resin molded product tends to be insufficient, and if it exceeds 50 parts by mass, the mechanical properties of the resulting resin molded product are reduced. Tend to.

Char-forming agent has a carbonate group, all SANYO capable of forming a carbonized layer in combustion, carbonate phenyl polystyrene resins such as polycarbonate, diphenyl carbonate acid, compounds such as di-carbonate triphenyl etc. mentioned et Re , At least phenyl carbonate polystyrene. These can be used individually by 1 type or in combination of 2 or more types.

  Moreover, it is preferable that a char formation agent is a compound which has a phenyl carbonate group from a viewpoint of the increase in the amount of residues after thermal decomposition. When the char forming agent has a phenyl carbonate group, the content of the phenyl carbonate group is preferably 35% by mass or more, more preferably 35 to 50% by mass based on the total amount of the char forming agent. When the content of the phenyl carbonate group is less than 35% by mass, formation of a carbonized layer at the time of combustion becomes insufficient, and the flame retardancy of the resin molded product tends to be reduced.

  The char-forming agent begins to form char at the early stage of combustion, and has a lower decomposition temperature than the above resin in thermogravimetric measurement according to JIS K7120 from the viewpoint of heat insulation of radiant heat from the combustion field and diffusion control of decomposition products. It is preferable that it is a compound which has this. In addition, as specific decomposition temperature of a char formation agent, it is preferable that it is 200-500 degreeC, and it is more preferable that it is 250-450 degreeC.

  Furthermore, the char-forming agent is preferably a compound having a residual rate at 600 ° C. equal to or higher than that of the resin from the viewpoint of increasing the amount of residue after thermal decomposition. In addition, specifically, the residual ratio of the char forming agent at 600 ° C. is preferably 0.1 to 99.9%, and more preferably 1 to 50%.

  In the resin composition of the present invention, the content of the char-forming agent is preferably 0.1 to 100 parts by mass, more preferably 5 to 50 parts by mass with respect to 100 parts by mass of the resin. More preferably, it is -20 mass parts. If this content is less than 0.1 parts by mass, the flame retardancy of the resulting resin molded product tends to be insufficient, and if it exceeds 100 parts by mass, the mechanical properties and workability tend to decrease. is there.

  The resin composition of the present invention preferably further contains an anti-drip agent. The anti-drip agent increases the melt viscosity of a resin (drip material) that melts by radiant heat from the combustion field. For example, fine particles such as silica and carbon black, and acicular fillers such as acicular boehmite Can be mentioned. These can be used individually by 1 type or in combination of 2 or more types. When the resin composition contains an anti-drip agent, it is possible to prevent the resulting resin molded body from being drip.

  When the anti-drip agent is contained in the resin composition of the present invention, the content is preferably 0.1 to 10 parts by mass, and 0.1 to 5 parts by mass with respect to 100 parts by mass of the resin. It is more preferable. When this content is less than 0.1 parts by mass, the drip prevention effect of the resin molded product tends to be insufficient, and when it exceeds 10 parts by mass, mechanical properties and workability tend to be lowered.

  The resin composition of the present invention preferably further contains an impact resistance improver. The impact resistance improver is to reduce the impact given to the resin. For example, it is desirable to disperse the resin in the form of a sphere, and there is no particular limitation. And terminal styrene-modified butadiene for PC, terminal carbonate-modified rubbery compound for PC, and the like. These can be used individually by 1 type or in combination of 2 or more types. When the resin composition contains an impact resistance improver, the mechanical properties (particularly impact strength) of the obtained resin molded product can be made to exhibit characteristics equal to or higher than those when a flame retardant is added.

  When the impact resistance improver is contained in the resin composition of the present invention, the content is preferably 0.1 to 20 parts by mass with respect to 100 parts by mass of the resin, and 0.1 to 10 parts by mass. More preferably. If the content is less than 0.1 parts by mass, the effect of improving the mechanical properties of the resin molded product tends to be insufficient. If the content exceeds 20 parts by mass, the impact resistance improver is inherently impact resistant. Since the material is flexible for the purpose of relaxing the resin, the resin itself becomes soft and tends to lower the elastic modulus.

  Furthermore, you may make the resin composition of this invention contain additives other than each component mentioned above. Examples of such additives include compatibilizers, reinforcing agents, antioxidants, weathering agents, plasticizers, lubricants, colorants, crystal nucleating agents, foaming agents, antistatic agents, preservatives, and the like. Although content of these additives will not be restrict | limited especially if it is a range which does not impair the effect of this invention, It is preferable that it is 50 mass parts or less with respect to 100 mass parts of said resins.

  In addition, when polycarbonate (PC) and polylactic acid (PLA) are used in combination as the resin constituting the resin composition of the present invention, both have poor compatibility, and the mechanical properties of the resulting resin molding are reduced. Occurs. However, by adding bismaleimide triazine (BT), the compatibility between the two can be improved, and the mechanical properties of the resulting resin molding can be improved. Moreover, when the resin composition contains a phosphorus-based flame retardant, bleeding of the phosphorus-based flame retardant in the resin molded article can be prevented by containing bismaleimide triazine.

  Moreover, it is preferable that the resin composition of this invention does not contain a halogen compound substantially from a viewpoint of an environmental problem, and it is preferable not to contain a phosphorus compound substantially from a viewpoint of recyclability. In the resin composition of the present invention, the specific content of the halogen compound and the phosphorus compound is preferably 0.5% by mass or less based on the total amount of the resin composition.

  Moreover, when using the compound whose decomposition point mentioned above is 400 degrees C or less as a radical trap agent, the resin composition of this invention contains the additive which shows endothermic reaction with the compound whose said decomposition point is 400 degrees C or less further. It is preferable. Thereby, the flame retardance of the resin molding obtained can be improved more. Here, examples of the additive include Li, Be, B, Na, Mg, Al, K, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, and Rb. , Sr, Cs, Ba salts or hydroxides. Among these, as the additive, calcium hydroxide is preferable. Moreover, when using these additives, it is preferable that the said compound whose decomposition point is 400 degrees C or less is a compound which has a 1 or more sulfate group or nitrate group per molecule.

  As an additive exhibiting an endothermic reaction with a compound having a decomposition point of 400 ° C. or lower as described above, from the viewpoint of preventing foaming due to a dehydration reaction between the additive and the resin in the resin composition, It is preferable to use surface-coated particles in which particles comprising an additive are used as core particles and a coating layer containing an organic compound is formed on the surface thereof.

  Although it does not restrict | limit especially as an organic compound which forms a coating layer, It is preferable that it has an organic group which can couple | bond with the said core particle. By bonding such an organic group to the core particle, a thin organic layer can be uniformly formed on the core particle surface. Here, in the organic compound, the organic group preferably has a binding group for forming a bond with the core particle at the terminal. Examples of the binding group include an ionic group (anionic group, cationic group), a hydrolyzable group, and the bond formed with the core particle may be an ionic bond or a covalent bond. Good.

  Examples of the organic group of the organic compound include groups that act as hydrophobic groups of surfactants (for example, higher fatty acid residues, higher alcohol residues, alkyl-aryl groups), polyamino acid residues, and the like. It is done.

  Moreover, it is also preferable to use a polysilicon as an organic compound which forms a coating layer.

  The method for producing the surface-coated particles is not particularly limited, and a known method can be used. Specific examples of the method for producing surface-coated particles include, for example, (i) dispersing core particles in an aqueous solution in which an organic compound metal salt and a dispersant are dissolved, and dropping an acidic aqueous solution into the organic particles on the surface of the core particles. A method of forming a coating layer by precipitating a compound; (ii) a core particle surface in which core particles are dispersed in a solution in which an organic compound and a dispersant are dissolved in an organic solvent miscible with water; (Iii) Dispersing the core particles in an aqueous solution in which a dispersant is dissolved, and dropping the polyamino acid salt aqueous solution therein to deposit the polyamino acid on the surface of the core particles. (Iv) dissolving a metal salt containing one or more selected from Mg, Ca, Al, Fe, Zn, Ba, Cu and Ni and a surfactant in water, Micelle structure or vesicle structure A metal soap particle having a metal hydroxide, having the metal soap particle developed in an organic solvent to transfer into reverse micelle particles, and a base acting on the metal ions contained in the reverse micelle particles to form a metal hydroxide , (V) preparing a developing solution in which an organic compound metal salt containing one or more selected from Mg, Ca, Al, Fe, Zn, Ba, Cu and Ni is developed in an organic solvent, (Vi) including one or more selected from Mg, Ca, Al, Fe, Zn, Ba, Cu and Ni. After preparing an aqueous solution in which a metal salt containing a metal and a dispersant or a chelate compound are dissolved, a metal ion aqueous solution is dropped into the aqueous solution, and a base is allowed to act on the aqueous solution containing the metal ion to form an organic compound metal. In salt (Vii) forming a coating layer by allowing a vaporized product of a cyclic organosiloxane compound to act on a core particle and ring-opening polymerization of the cyclic organosiloxane compound on the surface of the core particle. Method, etc.

The resin composition of the present invention has a radical trapping agent having one or more of the nitrogen atom and a sulfate group, a char-forming agent having the carbonate group, a phenyl carbonate polystyrene, as a resin, a styrene group Since it has a structure containing a compound and / or a phenyl carbonate group and a compound different from the char-forming agent, it has excellent processability, sufficient flame retardancy, excellent mechanical properties and A resin molded body having recyclability can be formed.

Next, the resin molded body of the present invention will be described. The resin molded body of the present invention is formed by molding the resin composition of the present invention. That is, the resin molded article of the present invention, the above-described radical trapping agent having one or more of the above Ki窒 atom and a sulfuric acid group, as the char-forming agent having a carbonate group, a phenyl carbonate polystyrene, as a resin, A compound having a styrene group and / or a compound having a phenyl carbonate group and different from the char-forming agent . Moreover, the resin molding of this invention may contain the anti-drip agent, the impact resistance improving agent, another additive etc. as needed like the said resin composition.

  The resin molded body of the present invention is, for example, known from the above-described resin composition of the present invention such as injection molding, injection compression molding, press molding, extrusion molding, blow molding, calendar molding, coating molding, cast molding, dipping molding, etc. It can obtain by shape | molding by the method of.

  The use of the resin molded body of the present invention is not particularly limited. For example, housings such as home appliances and office equipment or various parts thereof, wrapping films, storage cases such as CD-ROM and DVD, tableware, food trays, Examples include beverage bottles and chemical wrap materials.

Resin molding of the present invention has the above-described radical trapping agent having one or more of the nitrogen atom and sulfate groups, as the char-forming agent having a carbonate group, a phenyl carbonate polystyrene, as a resin, a styrene group Since it has a structure containing a compound and / or a phenyl carbonate group and a compound different from the char-forming agent , sufficient flame retardancy, excellent mechanical properties and recyclability can be obtained. Can do. And the resin molding of this invention can obtain the flame retardance more than V-2 in UL-94 specification, and it is 1 in the case of a resin simple substance in a cone calorimeter test of ISO5660-1. / 2 or less.

  In addition, since the resin molded body of the present invention can provide sufficient flame retardancy without using a halogen compound as a flame retardant and a phosphorus compound having a strong hygroscopic property, from the viewpoint of environmental problems and recyclability. Very useful. Furthermore, since the resin molded body of the present invention can sufficiently suppress deterioration due to heat, it is very useful as a housing of a copying machine, a printer or the like having a high temperature portion inside.

  FIG. 1 is an external perspective view of an image forming apparatus provided with a housing and office equipment parts according to an embodiment of the resin molded body of the present invention, as viewed from the front side. The image forming apparatus 100 in FIG. 1 includes front covers 120 a and 120 b on the front surface of the main body device 110. These front covers 120a and 120b can be opened and closed so that an operator can operate the inside of the apparatus. Thus, the operator can replenish the toner when the toner is exhausted, replace the exhausted process cartridge, and remove the jammed paper when a paper jam occurs in the apparatus. FIG. 1 shows the apparatus with the front covers 120a and 120b opened.

  On the upper surface of the main body 110, there are provided an operation panel 130 on which various conditions relating to image formation such as a paper size and the number of copies are input by an operation of an operator, and a copy glass 132 on which a document to be read is placed. Yes. Further, the main body device 110 includes an automatic document feeder 134 that can automatically convey a document on the copy glass 132. Further, main device 110 includes an image reading device that scans a document image placed on copy glass 132 and obtains image data representing the document image. Image data obtained by the image reading apparatus is sent to the image forming unit via the control unit. Note that the image reading device and the control unit are housed in a housing 150 that forms part of the main body device 110. The image forming unit is provided in the housing 150 as a detachable process cartridge 142. The process cartridge 142 can be attached and detached by turning the operation lever 144.

  A toner container 146 is attached to the casing 150 of the main body device 110, and toner can be replenished from the toner supply port 148. The toner stored in the toner storage unit 146 is supplied to the developing device.

  On the other hand, sheet storage cassettes 140a, 140b, and 140c are provided at the lower portion of the main unit 110. In addition, the main body apparatus 110 has a plurality of conveying rollers formed of a pair of rollers arranged in the apparatus, thereby forming a conveying path through which the sheets of the sheet storage cassette are conveyed to the upper image forming unit. ing. The paper in each paper storage cassette is taken out one by one by a paper take-out mechanism disposed near the end of the transport path and sent out to the transport path. Further, a manual paper tray 136 is provided on the side surface of the main body 110, and paper can be supplied from here.

  The paper on which the image is formed by the image forming unit is sequentially transferred between two fixing rolls that are supported by a casing 152 constituting a part of the main body device 110 and abut against each other. Paper is discharged to the outside. The main body device 110 is provided with a plurality of discharge trays 138 on the side opposite to the side on which the paper tray 136 is provided, and paper after image formation is discharged to these trays.

  In the image forming apparatus 100, the front covers 120a and 120b are subjected to many loads such as stress and impact during opening and closing, vibration during image formation, and heat generated in the image forming apparatus. Further, the process cartridge 142 receives a lot of loads such as attachment / detachment impact, vibration during image formation, and heat generated in the image forming apparatus. Further, the housing 150 and the housing 152 receive many loads such as vibration during image formation and heat generated in the image forming apparatus. Therefore, the resin molded body of the present invention is preferably used as the front covers 120a and 120b of the image forming apparatus 100, the exterior of the process cartridge 142, the casing 150, and the casing 152.

  EXAMPLES Hereinafter, although this invention is demonstrated more concretely based on an Example and a comparative example, this invention is not limited to a following example.

(Examples 1-4 and Comparative Examples 1-7)
A resin composition in which the components shown in Table 1 below were blended in the blending amounts (unit: parts by mass) shown in the same table was kneaded with a twin screw extruder (Toshiba Machine Co., Ltd., 58SS), and an injection molding machine (Nissei Resin Kogyo Co., Ltd., NEX360) was injection molded under conditions of a cylinder temperature of 220 ° C and a mold temperature of 40 ° C. ) A test piece was obtained.

  In Table 1, phenyl polystyrene carbonate as a char-forming agent is synthesized by the following procedure. In a 200 mL glass flask equipped with a condenser, put a stir bar, 0.2 g of poly (4-vinylphenol) (Aldrich, weight average molecular weight: about 8000), 18 g of diphenyl carbonate, 4-dimethylaminopyridine. 10 mg each was introduced. After substituting the inside of the container with nitrogen, the reaction was started by placing in a 180 ° C. oil bath. After 10 hours, the reaction was stopped by adding the contents to a large amount of methanol, and the reaction product was reprecipitated. The re-precipitate was collected by filtration and washed several times with methanol (yield: 165 mg). When the obtained reprecipitate was fractionated with methylene chloride, it was found that soluble polymer (phenylpolystyrene carbonate): 128 mg and insoluble polymer: 37 mg. The weight average molecular weight (Mw) and molecular weight dispersity (Mw / Mn) of the polymer soluble in methylene chloride were 22500 and 2.1, respectively. The weight average molecular weight and number average molecular weight of phenylpolystyrene carbonate mean the weight average molecular weight and number average molecular weight measured by gel permeation chromatography after dissolving the sample for measurement in deuterated chloroform at a concentration of 0.1% by mass. To do. In this example, Tosoh HLC-8220GPC is used as the gel permeation chromatograph. The phenyl carbonate group content in the obtained phenyl carbonate carbonate was 58.7% by mass based on the total amount of phenyl carbonate carbonate. Further, the obtained phenylpolystyrene carbonate had a decomposition temperature of 410 ° C. and a residual rate of 13% at 600 ° C. in thermogravimetry according to JIS K7120.

  In addition, ABS had a decomposition temperature of 380 ° C. and a residual rate of 8% at 600 ° C. in thermogravimetry according to JIS K7120. PC has a phenyl carbonate group content of 36% by mass based on the total amount of PC, a thermogravimetric measurement according to JIS K7120, a decomposition temperature of 470 ° C., and a residual rate at 600 ° C. of 20%. Met. Furthermore, melamine sulfate as a radical trapping agent had a decomposition temperature of 343 ° C. in thermogravimetry according to JIS K7120.

<Evaluation of workability>
About the resin composition of Examples 1-4 and Comparative Examples 1-7, according to JISK7210, the melt flow rate was measured using F-W01 by Toyo Seiki. The results are shown in Table 2.

[Characteristic evaluation test of resin molding]
Using each test piece (resin molding) obtained in Examples 1 to 4 and Comparative Examples 1 to 7, a characteristic evaluation test was performed according to the following procedure. The results are summarized in Table 2.

<Evaluation of flame retardancy (heat generation rate)>
Using the ISO multipurpose dumbbell test piece, the heat generation rate was measured with a cone calorimeter (CONE III, manufactured by Toyo Seiki Co., Ltd.) in accordance with ISO 5660-1.

<Evaluation of flame retardancy (UL-94)>
Using the UL test piece, a horizontal and vertical combustion test of UL-94 was performed. In addition, the result of a combustion test is a high level in order of V-0, V-1, V-2, and HB, and the flame retardance more than V-2 is often requested | required.

<Evaluation of thermal characteristics>
Using the ISO multipurpose dumbbell test piece, the residual ratio (%) at 600 ° C. was measured by thermogravimetry according to JIS K7120.

<Evaluation of mechanical properties (stress at yield point)>
Using the ISO multipurpose dumbbell test piece, the yield point stress was measured at a tensile speed of 50 (mm / min.) Using an autograph AG-IS-MS manufactured by Shimadzu Corporation.

<Evaluation of mechanical properties (Charpy impact strength)>
Charpy impact strength (kJ / m ² ) was measured with a digital impact resistance test device (DG-C, manufactured by Toyo Seiki Co., Ltd.) using the ISO multipurpose dumbbell test piece.

<Evaluation of recyclability>
The ISO multi-purpose dumbbell test piece is crushed, and the crushed test piece is used as a material and pelletized again with an extruder (TEM-H, manufactured by Toshiba Machine Co., Ltd.). Then, injection molding was performed under conditions of a cylinder temperature of 220 ° C. and a mold temperature of 40 ° C. to produce an ISO multipurpose dumbbell test piece (thickness 40 mm, width 10 mm). Using a test piece obtained by repeating this crushing and molding five times, the Charpy impact strength (kJ / m ² ) after recycling was measured in the same manner as the evaluation of the mechanical properties (Charpy impact strength). .

1 is an external perspective view of an image forming apparatus including a casing and office equipment parts according to an embodiment of a resin molded body of the present invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 100 ... Image forming apparatus, 110 ... Main body apparatus, 120a, b ... Front cover, 142 ... Process cartridge, 150, 152 ... Case.

Claims (8)

A radical trapping agent having one or more of a nitrogen atom and a sulfate group;
As a char-forming agent having a carbonate group, phenyl polystyrene carbonate,
As the resin, a compound different from the said char-forming agent having a different compound and / or phenyl carbonate groups and have a styrene group the char-forming agent,
Containing a resin composition.   The resin composition according to claim 1, wherein the radical trapping agent is a compound having a decomposition temperature lower than that of the resin in thermogravimetry according to JIS K7120.   The resin composition according to claim 1 or 2, wherein the radical trapping agent is a compound having one or more sulfate groups per molecule.   The resin composition according to any one of claims 1 to 3, wherein the radical trapping agent is melamine sulfate.   The said char formation agent is a resin composition as described in any one of Claims 1-4 which is a compound whose residual rate in 600 degreeC is more than equivalent to the said resin in the thermogravimetric measurement based on JISK7120.   The char forming agent according to any one of claims 1 to 5, wherein the char forming agent is a compound having a phenyl carbonate group, and the content of the phenyl carbonate group based on the total amount of the char forming agent is 35% by mass or more. The resin composition as described.   The resin composition according to any one of claims 1 to 6, wherein the radical trapping agent is melamine sulfate and the char-forming agent is phenylpolystyrene carbonate. Resin molded article obtained by molding the resin composition according to any one of claims 1-7.

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